randomly selecting between two columns of data in a table in R

so I have a table which contains data on a subject taking two versions of a test. What I would like to do is write some code that allows me to randomly select which version of the test to include in the final table and which to discard. Here is some example data:

ID     test1    test2

38762   21       36
37874   17       20
37813   15       17
37738   23       31
37470   25       36
37308   31       32
37039   25       16
36045   16        9

I need this to be as close to random as possible, so any help would be greatly appreciated.

Thanks in advance